.ON APRIL 2ND a gizmo resembling a snow device on the deck of the USS Hornet, an invalid aircraft-carrier moored in San Francisco Gulf, began generating a moisture of salty aerosol fragments. The scientific cooperation behind the job, the Marine Cloud Whitening (MCB) program, led due to the College of Washington, is actually exploring whether such aerosols might help to reduce environment change through a kind of "geoengineering". What performs this phrase mean-- and also why is it thus questionable?